JP2757613B2 - Amorphous core transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an amorphous magnetic transformer having a magnetic core wound with an amorphous magnetic alloy ribbon.

[0002]

2. Description of the Related Art In recent years, amorphous magnetic alloy ribbons have been studied for stationary equipment such as transformers because of their low loss and good magnetic properties.

Conventionally, this type of amorphous magnetic core transformer is still under study, and has not been commercialized, and there is no specific configuration, and the same configuration using a silicon steel plate has been studied. . An amorphous magnetic core has a magnetic characteristic when stress is applied.
Some improvements have been considered due to the large drop in
Was. It is to reduce the weight of the coil on the magnetic core
Use coil supports and tighten the magnetic core up and down.
It was to reduce. Especially in the upper part, the height of the upper part of the magnetic core is
When it is higher than the top of the coil support, the magnetic core is tightened with strong force
And the magnetic properties are degraded. Them
Based on this, the configuration will be described below with reference to FIGS. As shown in the figure, the thickness is 25μ.
m, a magnetic core 1 formed by winding an amorphous magnetic alloy ribbon, a coil 2 composed of a primary winding and a double magnetic winding, a coil supporting member 3 formed of a press board, polyester or the like, and a case (not shown). And upper and lower connecting plates 5, upper and lower connecting plates 5, lower fittings 6 , insulating spacers 8 and the like, and the coil 2 is connected to upper and lower connecting members 4, upper and lower connecting plates 5, Assembled in the bracket 6. Core 1 is assembled with the coil 2 through an insulating spacer 8 in a state where a gap portion 7 and the upper bracket 4 is placed on the lower bracket 6, the magnetic core band 9 iron for better fixation The upper metal fitting 4 and the lower metal fitting 6 are integrally fixed at the center of the upper metal fitting 4 and the lower metal fitting 6 along the magnetic core as much as possible, including the first corner part. these
With the configuration described above, there is not much problem with the magnetic core made of silicon steel.
However, the weight of the coil 2 is not applied to the magnetic core 1.
Therefore, the band tightening force when fixed integrally with the band 9
Force is applied to the magnetic core 1 via the upper bracket 4 even if the
Change in shape is small, and magnetic characteristics
Good is seen. These have a joint at the top of the magnetic core.
When it comes to the thickness of the magnetic core with a butted structure in silicon steel sheet
Is not different from other parts, but it is over
The wrap structure is improved, but in that case the winding thickness of the magnetic core is other
20% to 70% larger than that of
It is. In particular, the top is easy to swell and makes contact with the upper bracket 4.
The contact area tends to be smaller.

[0004]

However, in the above-mentioned conventional structure, the magnetic core is fixed very well, but the amorphous magnetic core is not fixed.
It is very sensitive to stress and changes its shape with a small force,
The core becomes brittle and easily cracked after annealing.
In order, of course when the corner portion of the magnetic core 1 during the manufacturing operation tightening the band 9, the mounting portion 4a of the upper fitting 4
Even when suspended using, the integrated body is vertically connected
The plate 5 and the band 9 support the entire weight, and
As a result, the band 9 is pulled up and down due to
Local stress is applied to the corners of
Deterioration of magnetic properties and generation of fragments were observed. Crushed pieces
The edge poses a significant problem for reliability. The gap 7
If a is provided, susceptible to vibration, especially vertical vibration
The accompanying stress is likely to be applied to the magnetic core, causing the same problems as above.
I was born. This is because each amorphous magnetic alloy ribbon is made of silicon steel
It does not have a uniform thickness due to the manufacturing method like a thin strip of plate,
Also, apply an adhesive between the wound layers
Because they cannot be integrated, a joint with an overlapping structure
Variation is large by hand, resulting in gradual lamination.
Is likely to cause stress concentration and deformation.
ing. Amorphous magnetic cores have low elasticity and deform once
It is difficult to return to the beginning, so once the magnetic properties are
Even if the power is lost, it will not return to its original state, so
It is important to make things less likely to occur from the beginning.
You.

[0005] The present invention solves the above-mentioned problems and provides a magnetic core.
The stress applied to the magnetic core
The front and rear direction is fixed and supported in a large area, and
Provides an amorphous core transformer that has a structure that does not apply force and that can reduce the stress applied to the corners of the magnetic core, preventing the magnetic properties from deteriorating, and reducing the deformation and crushing of the magnetic core. The purpose is to do.

[0006]

In order to achieve the above object, the present invention provides a magnetic core formed by winding an amorphous magnetic alloy ribbon, a core bobbin supporting the internal shape, and a magnetic core provided on the magnetic core. A coil supporting material provided above and below the coil, an insulating spacer between the magnetic core and the coil, upper and lower metal fittings for fixing the magnetic core to a case, an upper and lower connecting plate, and a band. The coil support is provided above and below the coil to support the coil, and the insulating spacer is provided above and below the coil to support the magnetic core via the core bobbin, and extend the outer surface of the magnetic leg of the magnetic core. Near the line or
It has the contact end of the band and the upper and lower metal fittings at the outside position
It is fixed in this way , and furthermore, it is configured to be integrally supported by upper and lower connecting plates.

[0007]

In the above construction, the weight of the coil applied to the magnetic core is reduced by providing the coil support members above and below the coil to support the coil, and the coil is supported in the up-down direction and the left-right direction.
The upper and lower brackets are used to fix and support the magnetic core in a wide area in the direction, front and back, and to fix the magnetic core outside the extension of the inner surface of the magnetic leg.
And the contact end portion of the band reduce the force for tightening the corner of the magnetic core with the band and disperse the force applied to the magnetic core, thereby preventing the magnetic characteristics of the magnetic core from deteriorating, deforming and crushing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment,
The same components as those in the above-described conventional example are denoted by the same reference numerals, and description thereof will be omitted. As shown in the figure, a magnetic core 1 formed by winding an amorphous magnetic alloy ribbon, a coil 2 composed of a primary winding and a secondary winding, a coil supporting member 3 formed of a press board or a polyester or the like, Upper and lower metal fittings 11 and 12, which are magnetic core supporting members, an upper and lower connecting plate 13, a core bobbin 14 made of aluminum, stainless steel, iron or the like for supporting the internal shape of the magnetic core 1, and an outer peripheral portion of the magnetic core 1. Protective member 15 made of silicon steel plate or the like, support spacer 16 made of an insulating material such as rubber, resin, or press board for supporting between magnetic core 1 and coil 2, cushioning materials 17 a and 17 b, and a band for fixing magnetic core 1 18 and the like. The cushioning materials 17a and 17b are made of a woven cloth mat such as polyethylene terephthalate (PET), or a material having elasticity such as paper or silicon rubber provided with voids. Then, assembling, open the upper part which is the joint part of the magnetic core 1 after being annealed, insert the coil 2 into the magnetic leg of the magnetic core, and install the core bobbin 14 which is divided at the time of assembling inside the magnetic core 1. Then, they are sequentially laminated with a joint structure such as overlap or butt and assembled to assemble.
, The insulating spacer 16 is disposed on the core bobbin 14, the lower bracket 12 and the coil support 3 are disposed on the magnetic core 1 via the cushioning materials 17a and 17b, and then the lower bracket 14 is positioned downward. And assemble the upper part in the same way. Thereby, the coil 2 is supported by the upper metal fitting 11, the lower metal fitting 12, and the upper and lower coil supporting members 3, and the upper and lower insulating spacers 16 are provided.
And the coil 2 so as to support the core bobbin 14. Then, the upper and lower metal fittings 12 and 12 are fixed integrally with the band 18 so as to have a fixed contact portion between the band 18 and the point B corresponding to an extension line of the outer surface of the magnetic leg.
Thereafter, it is fixed by the upper and lower connecting plates 13 in order to maintain the entire shape. If the band 18 is fixed only, the metal fittings may be displaced during suspension of the manufacturing process or when the case is attached, or the core may expand between the bands. The directional deformation is fixedly supported by the combined area of the band and the upper and lower connecting plates to disperse the stress. Real
In the embodiment, the upper metal fitting 11, the lower metal fitting 12, and the band 18 are used.
Solid the position of the constant contact end indicates the case of the point B, the upper
Change the position of the notch of the metal fitting 11 or lower metal fitting 12, etc.
As the position of the fixed contact end moves from point A to point B, the weight of the magnetic core 1 and the tightening force of the band 18 at the corner of the magnetic core 1 decrease. Therefore, even if the mounting portion 11a of the upper metal fitting 11 is suspended, the weight of the coil 2 is hardly applied to the magnetic core 1. Further, since the band 18 supports the entire bottom surface of the magnetic core 1, the stress applied to the magnetic core 1 is reduced and equalized, so that the deformation and crushing of the magnetic core 1 is reduced, the deterioration of the magnetic characteristics is reduced, and the characteristic variation is reduced. Can be suppressed. As shown in FIG. 3, the position where the band bends on the bracket when integrally fixed, that is, the position of the fixed contact end portion between the bracket and the band, is from point A to point B which is the intersection of the extension of the inner surface of the magnetic leg and the bracket. Up to the outside, the iron loss of the transformer rapidly decreases. Outside the point B, the iron loss of the transformer is small and constant regardless of the position. The magnetic core 1 has a thickness of 25
The core bobbin 14 is provided on the inner peripheral portion of the magnetic core 1 because the mechanical strength is small and fragile because an amorphous magnetic alloy ribbon of μm is used.
Protective material 15 is provided on the outer periphery, and upper and lower
Are provided to increase the strength and to prevent concentration of stress on the band 18, thereby preventing shape deformation and generation of crushed pieces. Further, since the cushioning members 17a and 17b are provided, the magnetic core 1 supports the stress due to its own weight and the like on a wide contact surface, thereby preventing the magnetic characteristics from deteriorating and changing the shape. Can be fixed sufficiently. In addition, the magnetic core 1 and the upper bracket 1
When a design is made to provide a gap between the two, by providing the cushioning material 17a in the gap, it is possible to prevent deterioration of magnetic properties and improve fixation. For this reason, it can sufficiently withstand vibration during manufacturing and transportation. The laminated end face of the magnetic core 1 is coated and fixed to increase the strength, and even if the magnetic core 1 itself becomes fragile after annealing, the magnetic core 1 and the rigid coil support member 3 are manufactured by the cushioning materials 17a and 17b during manufacturing. It is hard to crush because it does not contact during transportation.

[0009]

As is apparent from the above embodiment, the amorphous magnetic core transformer of the present invention comprises a magnetic core formed by winding an amorphous magnetic alloy ribbon, a coil provided on the magnetic core, A coil supporting member provided above and below the coil; and various magnetic core supporting members for fixing the magnetic core to the case. The coil supporting member is provided above and below the coil to support the coil, and Fixing the core support with the upper and lower brackets and the band is the outer surface of the magnetic leg
The upper and lower metal fittings and the band have contact end portions near or outside the extension of the above, and are further integrated by being supported by upper and lower connecting plates. With this configuration, the fixing strength as the magnetic core is very small, and the weight of the coil applied to the amorphous magnetic core, whose magnetic properties are greatly reduced by stress, is almost eliminated, and the weight is generated due to the inevitable weight and fixing of the coil. The applied stress can be extremely dispersed by fixing and supporting the magnetic core in a wide area in the vertical direction, the horizontal direction, and the longitudinal direction. Especially when fixing with a band
Since the entire bottom surface of the magnetic core is supported via upper and lower brackets,
The influence of stress concentration caused by directly tightening the corners of the entire magnetic core with a band can be reduced. In addition, the upper and lower connecting plates can prevent a change in shape even if a stress is applied to the magnetic core generated during the manufacturing process or the movement after the fixing by band tightening, thereby reducing the deterioration and crushing of the magnetic characteristics.
The stress applied to the magnetic core itself is reduced, and the magnetic core is fixed and supported in a large area in the vertical, horizontal, and front-rear directions, so that local stress is not applied to the magnetic core. To prevent the magnetic properties from deteriorating,
Further, the present invention provides an amorphous magnetic core transformer capable of reducing deformation and crushing of the magnetic core.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of an amorphous magnetic core transformer according to an embodiment of the present invention.

FIG. 2 is a partial sectional side view of the amorphous magnetic core transformer.

FIG. 3 is a diagram showing the relationship between the positions of fixed contact ends of metal fittings and bands of the amorphous magnetic core transformer and iron loss.

FIG. 4 shows a transformer in which the structure of a conventional transformer is applied to an amorphous magnetic core.
Partial sectional plan view of the pressure device

FIG. 5 is a partial cross-sectional front view of the transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic core 2 Coil 3 Coil support material 11, 12 Metal fittings (magnetic core support material) 13 Upper and lower connection plate 14 Core bobbin 18 Band

────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiromitsu Hara 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Field (Int.Cl. ⁶ , DB name) H01F 27/00-27/42

Claims (1)

(57) [Claims] 1. A magnetic core formed by winding an amorphous magnetic alloy ribbon, a core bobbin supporting the internal shape, a coil provided on the magnetic core, and a coil supporting member provided above and below the coil. An insulating spacer between the magnetic core and the coil, upper and lower metal fittings for fixing the magnetic core to the case, an upper and lower connecting plate, and a band, and the coil supporting material is provided above and below the coil to form the coil. Supporting and providing the insulating spacers above and below the coil to support the magnetic core via the core bobbin, or near an extension of the outer surface of the magnetic leg of the magnetic core or
It has the contact end of the band and the upper and lower metal fittings at the outside position
Amorphous magnetic core transformer fixed in this way , and further supported and integrated by upper and lower connecting plates.